Adding tags to DAG runs

### Description

Currently I see only option to tag DAGs. I don't see such an option for DAG runs.
It will be quite useful for me, to add and filter runs by tags.

### Use case/motivation

I'd like to filter runs based on tags. For example, I have different DAGs (predict, train, etc.) that I could tag with tags like 'model_name=mymodel', then I can see all runs that used that model.
This also gives the user a way to group dagruns based on keys like experiment=name, such management exists in other dag runners (e.g kubeflow)

### Related issues

_No response_

### Are you willing to submit a PR?

- [x] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

Start by tracing how DAG tags are stored and exposed, then inspect the DAG-run listing and filtering paths. The work is done when DAG runs can receive tags such as model_name=mymodel or experiment=name and users can filter runs by those tags.

Written by the indexing model from the issue text.